Hi, never owned a car before.

If I purchase a used car here in Quebec that happens to have some visible rust (so there’s certainly more that I can’t see) and if it’s cheap enough, can I just decide to not care? What’s the worst that could happen by deciding to not do anything about it?

If however I wanted to make sure it didn’t get any worse, without going through the trouble of removing the existing rust, what should I do then?

Just curious